476 Reviews-—Life of Sir W. E. Logan. 
should have been there sooner and looked more sharply and then 
you might have seen it put in.” Not long afterwards, while some 
visitors were witnessing the extraction of coal from the same bore- 
hole, they observed that the coal was mixed with bread and cheese, 
which had accidentally got into the hole during the preliminary 
packing operation. This put an end to the Bowmanville excitement. 
Eventually it turned out that the bore-rod had never reached the 
solid rock at all, but had simply passed through a portion of the 
superficial deposits (pp. 262-265). 
One of the great achievements of Logan during his long labours 
in Canada, was the establishment of the Laurentian System. Here 
is Prof. Harrington’s history of its origin :—“ For a long time great 
quantities of erratic masses of a rock composed largely of Labrador 
felspar were known to exist in the valley of the St. Lawrence; and 
in 1852 it was discovered in situ by Logan in the townships of 
Morin and Abercrombie, and described by Hunt in his official report 
for that year. Subsequently the rock was shown to belong to a great 
stratified series resting unconformably upon the Laurentian gneiss. 
It was hence called by Sir William the Upper Laurentian Series, and 
was believed by him to intervene between the Lower Laurentian 
and the Huronian, although nowhere found in juxtaposition with the 
latter. We have already seen that the Laurentian as originally 
described includes a lower group of gneisses without limestones, to 
which succeeds a group of gneisses and interstratified limestones. 
These two groups together constitute the Lower Laurentian of 
Logan; but inasmuch as the upper division might be confounded 
with the Upper Laurentian proper, it has been sometimes termed 
Middle Laurentian. Owing to the occurrence of the series in 
Labrador, and the predominance in it of Labrador felspar, the Upper 
Laurentian has sometimes been called the Labradorian series; and 
in 1870 Hunt suggested that it should be termed the Norian series, 
inasmuch as it is largely composed of rocks similar in character to 
the norites of Esmark found in Norway. The facts obtained with 
regard to the above-mentioned groups previously to 18638, by Logan, 
Hunt, and other members of the staff, were summed up in the 
‘Geology of Canada,’ and the rocks there described may be tabulated 
as follows :— 
Feet. 
sae as s eee 1! Gneiss of Trembling Mountain, ete. .......... 5,000 ? 
( Trembling Lake Limestone ........ssssssssscssssssssee 1,500 
2nd OrtHOclise Ovleiss ye errr nee 4,000 
ae Green Lake Limestone bands of gneiss, etc. | 2,500 
a Tae eee vid! ard Orthoclase 'sMeissy 2:12.20 sie eho eee 3,000 
; Grenville Limestone, bands of gneiss, etc. 700 
4th Orthoclase gneiss, including a thin bed 
of limestone and a bed of quartzite..... 5,000 
A } 
5) pa ary (ely. Anorthosite rocks, limestone, and gneiss..... 10,000? 
. Conglomerates, chloritic and other schists 
4, Hurowian. { ‘limestone, CHC. | bins. teesinaeniee een 18,000 
Sir William’s more important work in the cause of science may 
